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A Nationwide Survey of SAPS II Assessing Practices and Its Accuracy

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A Nationwide Survey of SAPS II Assessing Practices and Its Accuracy Original article | Published 23 December 2014, doi:10.4414/smw.2014.14090 Cite this as: Swiss Med Wkly. 2014;144:w14090 SwissScoring – a nationwide survey of SAPS II assessing practices and its accuracy Marco Previsdominia, Bernard Ceruttib, Paolo Merlanic, Mark Kaufmannd, Elisabeth van Gessele, Hans Ulrich Rothenf, Andreas Perrena a Intensive Care Unit, Department of Intensive Care Medicine – Ente Ospedaliero Cantonale, Ospedale San Giovanni, Bellinzona, Switzerland b Unit of Development and Research in Medical Education, Faculty of Medicine, University of Geneva, Geneva, Switzerland c Intensive Care Unit, Department of Intensive Care Medicine – Ente Ospedaliero Cantonale, Ospedale Civico, Lugano, and Intensive Care Unit, University Hospital and University of Geneva, Geneva, Switzerland d Department of Anaesthesiology, University Hospital, Basel, Switzerland e Center for Interprofessional Education and Simulation, Faculty of Medicine, University of Geneva, Switzerland f Department of Intensive Care Medicine, Bern University Hospital, Inselspital, Bern, Switzerland Summary (physician vs. nurse), experience, initial SAPS II training, or presence of a quality control system. OBJECTIVE: The first description of the simplified acute CONCLUSION:This nationwide survey revealed substan- physiology score (SAPS) II dates back to 1993, but little tial variability in the SAPS II scoring results. On average, is known about its accuracy in daily practice. Our purpose SAPS II scoring was overestimated by more than 13%, ir- was to evaluate the accuracy of scoring and the factors that respective of the profession or experience of the scorer or affect it in a nationwide survey. of the structural characteristics of the ICUs. METHODS: Twenty clinical scenarios, covering a broad range of illness severities, were randomly assigned to a Key words: SAPS II; severity score; accuracy; SwissDRG convenience sample of physicians or nurses in Swiss adult intensive care units (ICUs), who were asked to assess the Introduction SAPS II score for a single scenario. These data were com- pared to a reference that was defined by five experienced The simplified acute physiology score II (SAPS II) has researchers. The results were cross-matched with demo- been used for many years for clinical research and quality graphic characteristics and data on the training and quality measurements in European intensive care units (ICUs) control for the scoring, structural and organisational prop- [1–3]. Its original goal was to provide an estimated risk erties of each participating ICU. of hospital mortality for the patients admitted to the ICU, RESULTS: A total of 345 caregivers from 53 adult ICU which was based on given characteristics, selected from a providers completed the SAPS II evaluation of one clinical large sample of medical and surgical cases and assessed scenario. The mean SAPS II scoring was 42.6 ± 23.4, with with logistic regression analyses [4]. The score is assigned a bias of +5.74 (95%CI 2.0–9.5) compared to the reference 24 hours after admission in the ICU and ranges from 0 to score. There was no evidence of bias variation according 163 points, based on age, type of admission, presence of to the case severity, ICU size, linguistic area, profession specified chronic diseases and the worst observed value of a total of 12 clinical items connected with organ function [4, 5]. It is likely that it is still the most commonly utilised sever- List of abbreviations ity adjustment tool for research in Europe even though a GCS Glasgow coma scale newer severity score has been developed (SAPS III) [6, G-DRG German diagnosis related groups 7]. Moreover, the SAPS II is used to calculate the degree ICC Intraclass correlation coefficient of hospital reimbursement for intensive care unit patients ICU Intensive care unit in Germany (G-DRG) and Switzerland (SwissDRG) [8, 9]. IQR Inter-quartile range The SAPS II is also a key process indicator of the Swiss NEMS Nine equivalents of nursing manpower use score PDMS Patient data management system ICU Minimal Dataset, a quality assurance monitoring tool SAPS II Simplified acute physiology score II that is mandatory for all certified ICUs in Switzerland [10]. SAPS III Simplified acute physiology score III The vast majority of information on severity scores was SD Standard deviation generated in a research setting and is based on values that SOFA Sequential Organ Failure Assessment were recorded by specifically trained personnel. Few data SwissDRG Swiss diagnosis related groups are available on the quality of the assessed SAPS II as it Swiss Medical Weekly · PDF of the online version · www.smw.ch Page 1 of 8 Original article Swiss Med Wkly. 2014;144:w14090 is used in the ICUs [11–13]. A small, retrospective, mul- General study design ticentre audit conducted in Southern Switzerland showed This study was based on online, self-administered ques- that the accuracy of the SAPS II scores, assessed by in- tionnaires addressed to ICU head physicians and ICU bed- tensive care nurses, is rather poor [14]. However, it is un- side personnel. Two steps of data collection, as outlined be- known whether such results can be confirmed in a larger low, were carried out between April and June 2012. sample of ICU healthcare providers with different profes- In a first survey the heads of certified adult Swiss ICUs sional and cultural backgrounds. Moreover, the process of were invited to complete an online questionnaire that was scoring may be influenced by the different organisations or available in three national languages (German, French, and structures in the ICU. Italian). The 36 items on the questionnaires included ques- The primary aim of this nationwide survey was to investig- tions on the socio-demographics and professional quali- ate the reliability and the accuracy of the caregiver-recor- fications (6 items), the ICU structure and organisation (7 ded SAPS II scores by estimating the difference between items), the SAPS II scoring procedures and training for them and the reference values established by five study au- SAPS II scoring (23 items). thors. As a secondary aim, we explored the potential link In a second phase, staff who are usually involved in SAPS between any bias and both the ICU and staff characterist- II scoring were encouraged by the heads of the ICUs to ics. participate in the SAPS II scoring online survey. If they agreed, they received a link to access the survey with a Methods 6-digit key code, known only by the statistician in charge of the analysis, which would allow matching with the centres. An online questionnaire, including 11 items (two socio- demographic items, four items about qualifications and SAPS II training, and five items about SAPS II scoring procedures) was followed by one (out of 20) randomly se- lected clinical scenario that the participant scored with the SAPS II. Every scenario described a hypothetical patient, with the reasons for admission to the ICU (Supplementary file 1) and included charts with vital parameters, laborat- ory values, ventilation details and administered medication. The scenarios were designed to depict clinical situations and sequences of events that are commonly observed in a Swiss adult ICU as well as to cover a large range of SAPS II scores. The reference values of every scenario were established by five different study authors, who as- signed the score separately. Differences were discussed un- A til consensus on the 15 items and sum-score was reached. Caregivers from centres where the SAPS II score was re- corded based on values supplied by a patient data manage- ment system (PDMS) were also given a randomly selec- ted scenario, but this was presented with a specific digital layout using either Centricity Critical Care (Version 7.0 SP3, General Electric Healthcare, Barrington, IL, USA) or MetaVision (Version 5.46.44, iMDSoft, Needham, MA, USA). The aim was to offer the participants the same sys- tem that they used in their current clinical practice. Parti- cipants were encouraged to handle their cases as usual and without external support. For every ICU, the following key indicators related to structure were retrieved from the national ICU Minimal B Dataset: average SAPS II, number of beds per unit and Figure 1 number of patients per year. A Relationship between the rater assessed SAPS II scores and the The objectives and design of this quality assurance study reference value. The dots stand for every observation made, i.e. were presented to the Executive Committee of the Swiss the score given by every participant (y-value) versus the reference Society of Intensive Care Medicine, who endorsed the pro- value (x-value). The 16 vertical grouped values stand for the reference values of the 20 cases that have been assessed by the ject. The anonymity of the participating caregivers and data participants (some cases had the identical SAPS II reference safety were ensured. The Cantonal Ethics Committee Ti- score). The continuous line was fitted with a linear mixed effect cino (6500 Bellinzona, Switzerland) approved the protocol after model selection. The dotted lines denote the 95% confidence and waived the need for informed consent. interval around the fitted line. B Bland-Altman plot showing the relationship between the difference between observed and reference values and the average Statistical analysis of reference and observed values. The dotted lines show the mean Previous studies reported an intra-class correlation coeffi- difference ±1.96 standard deviation. cient (ICC) of 0.8–0.9
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